Violence being an issue has nothing to do with sex though. These are two separate things, that sometimes overlap. I do agree there is an overexposure to violence, but that doesn't mean there isn't one of sex.

I don't think sex should be a taboo like it's treated, but I don't think it's meant to be that open. Talking about it is fine, PDA is not (I'm assuming you're talking about full blown make out sessions. Kisses are fine in most environments, and couples getting handsy can be acceptable in the appropriate venues - like a dance club. Still, with limits). A 23 yo with a 16 yo is NEVER okay in my opinion. bemused_Bohemian already explained why, and even if they do love each other, it's on the older person responsibility to not engage in sexual relationships with minors.

About breast, it's a more delicate issue. Breastfeeding is one thing, going shirtless is another with different connotations. Breasts might not be a sexual organ, but the female ones did evolve for sexual appeal (big breasts are associated with lactation, the bigger the breast, the more milk and therefore the one with more milk is considered a better), though that sexual appeal is on a more 'animal' level and not something females can control, so that's not a strong argument. Frankly it makes me uncomfortable, just put shirts on everyone and call it a day (GUYS INCLUDED). That way it's equal and the general public isn't uncomfortable.

Sex isn't a bad thing, and it isn't something to be shamed. But it's an INTIMATE thing, not a PUBLIC one. Talking and informing people about it is important, but PDA and sex with minors is disgusting, disturbing, and in the later's case, the adult should go to jail. No one has to be anyone's unconsented voyeurs either.

My response depends on the details discussed in this topic and the location. I will prefer to not hear the topic in locations such as quiet restaurant or a grocery market for example, if there is no specific reason to discuss and if the details are lewd.

If people are explicitly conversing of coitus or sex related subjects in front of young children regardless of location, that will make me uncomfortable and disgusted.

Me and my little brother got into a competition to see who can say p*n*s the loudest in our nearby Arby's. So, I can't say I am at a point where it should bother me. But, I guess it would be based off who is nearby and the mood I am in.
Just a side note. I wouldn't go into detail about my sex life. 1. It's nonexistent and for 2. That's not the kind of person I am.
What I meant was that if a question or topic related to sex came up, It would be based of those two reasons as to whether or not I would feel embarrassed answering it.

some ot that isn't so strange:
1. Exposed female breast in public are great, unless you get an erection. Worse if you are with your wife or girlfriend. It's a rude thing to do to someone.
2. Rundown. Could be empathy? Compassion maybe? There but for the grace of god go I? Does bug me on my road trips that in the Carolina's, people will stop their cars in the fast lane, get out the the car, and look. Maybe they want to make sure it isn't someone they know?
3. PDA. They're making people jealous. Rubbing into peoples faces that they have something going on and you dont' They should get a room.
4. Mature Game. Do the parents actually let the child play it, or do they play it themselves?
5-6 Underage Sex. I am with you there. It would have been a dream come true if that happened to me. I am sure I would have endured the psychological damage with a smile on my face.
7 Group Sex talk. If your experience isn't up to snuff with everyone else, it is uncomfortable. So, if you didn't have sex while doing a handstand in a hammock and farting the star spangled banner when you were 14, how do you keep up with the conversation?